title: Specific cleavage of a target RNA from HIV-1 by mammalian tRNA 3' processing endoribonuclease directed by an RNA heptamer.
abstract: Mammalian tRNA 3' processing endoribonuclease (3' tRNase) can recognize pre-tRNA-like complexes between a 5' half tRNA(Arg) and a 3' half tRNA(Arg) with a 3' trailer, and can cleave the 3' half tRNA(Arg) after the discriminator nucleotide (Nashimoto M., 1996, RNA, 2:523-534). 3' tRNase cleaved the 3' half tRNA(Arg) in the presence of a 7-nt 5' tRNA(Arg) composed only of the acceptor stem region with a catalytic efficiency comparable to that of cleavage directed by the intact 5' half tRNA(Arg). The catalytic efficiency of cleavage directed by the heptamer decreased as the stability of the T stem-loop structures of 3' half tRNA(Arg) variants decreased. No heptamer-directed cleavage of a 3' half tRNA(Arg) was detected in the absence of T-stem base pairs. This strategy for targeted RNA cleavage using an RNA heptamer was applied to the cleavage of two target RNAs from HIV-1. An HIV-1 RNA containing a stable hairpin structure corresponding to the T stem-loop was cleaved efficiently, whereas no cleavage of a second HIV-1 target without any stable hairpin structure was detected. In this method, an RNA heptamer can direct efficient RNA cleavage with a higher specificity than expected.
authors.affiliation: JT Life Science Research Laboratory, Kanagawa, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nashimoto
authors.forename: R
authors.initials: R
authors.lastname: Kaspar
mesh_terms: D001483:Base Sequence; D002384:Catalysis; D004722:Endoribonucleases / Q000378:metabolism*; D015497:HIV-1 / Q000235:genetics*; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012313:RNA / Q000138:chemical synthesis / Q000378:metabolism*; D012347:RNA, Transfer, Arg / Q000378:metabolism*; D012367:RNA, Viral / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D012347:RNA, Transfer, Arg; D012367:RNA, Viral; D012313:RNA; D004722:Endoribonucleases; C072389:tRNA 3'-processing endonuclease